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[SP_3.2]

Just wondering what pressures you lot run your tyres at the book says for 235 is 31 psi i have seen that some have there's higher are there any avantages to this?.

Also I tend to drive the car without opening her up much . Just how often should I take her tp full rev range and use sport,s to keep the enging in good shape


Thanks Guys

[TheBoy]

I tend to run my MV6 (prefacelift) 32 at rear, 35 at front  (38F/45R heavy load).

I'm never shy when it comes to 'exercising' the motor

[IrmscherKris]

I run my 235's at 34PSI front and rear.

The odd blast every now and again will keep it tip top.


 

[Kevin Wood]

My rear 235s were showing signs of overinflation when I changed them recently (down to TWI in the middle, 4mm at the oustide edges!). During most of their wear I didn't own the car but there is not huge weight over the rears with an empty boot (and a lot of weight with a full boot and back seat) so it would probably be more prudent to adjust the rear tyre pressures according to load (although it's easy to forget). I was running mine at 34 but am going to reduce the rears to 31 and see how that goes.

Fronts should see less load variation due to them supporting a cast iron V6 all the time!

I don't think the mythical "italian tune-up" is necessary not does it make much difference how an engine is driven once it's run in, but if you've got it, you might as well use it every so often!

As long as it is serviced regularly (more so than the manufacturer's recommendations!), ideally doesn't spend all its' life on shopping trips but gets a few long motorway journeys, and, most important of all, isn't ragged from cold it should be fine.

Kevin

[TheBoy]

My rear 235s were showing signs of overinflation when I changed them recently (down to TWI in the middle, 4mm at the oustide edges!). During most of their wear I didn't own the car but there is not huge weight over the rears with an empty boot (and a lot of weight with a full boot and back seat) so it would probably be more prudent to adjust the rear tyre pressures according to load (although it's easy to forget). I was running mine at 34 but am going to reduce the rears to 31 and see how that goes.

Fronts should see less load variation due to them supporting a cast iron V6 all the time!

I don't think the mythical "italian tune-up" is necessary not does it make much difference how an engine is driven once it's run in, but if you've got it, you might as well use it every so often!

As long as it is serviced regularly (more so than the manufacturer's recommendations!), ideally doesn't spend all its' life on shopping trips but gets a few long motorway journeys, and, most important of all, isn't ragged from cold it should be fine.

Kevin

Reason I run fronts harder than spec was to even out the wear - even at the recommended 32PSI, the middle was wearing less than the edges...

[IrmscherKris]

I don't think the mythical "italian tune-up" is necessary not does it make much difference how an engine is driven once it's run in, but if you've got it, you might as well use it every so often!

I'd have to disagree with you on that, any car I've bought off people who don't thrash seem to feel locked (if that makes sense?). After a few good sympathetic beatings they feel.... nice and loose (ish).

You seem to get better MPG IMO from doing this too.

[TheBoy]

Tunnie commented that his 2.2 seems 'a bit freer' after I gave it a good ragging trying to keep up with his 2.5 Elite he bought from Ronnie McB

[bob.dent]

I have 235/40/17's on the front and 265/40/17's on the rear and I had been running mine at slightly lower pressures since I had new tyres put on as the previous tyres (rears) had shown signs of over inflation by wearing in the middle. Big Rod (the previous owner) said he had normally run them at 30psi all round, so I've been running them at 28psi.
Since then I noticed my mpg reduced to around 22 on average to and from work. I checked my pressures last night and they were slightly down on the original 28psi I put in a few weeks ago, so thought I'd try them back at 30psi as these tyres are a slightly softer compound than the last set. I reset my MID this morning and was amazed that after my 22 mile journey to work my average mpg had gone up to over 25.

It will be interesting to see what average mpg I get going to Newent this weekend. :-?

[TheBoy]

After the lakes, I kept forgetting to reduce pressure, so 38F/45R for about 2 weeks. MPG went right up.  Ride comfort and handling were compromised though...

[Markjay]

33psi all around, I always put the pressure up from the manufacturer's recommendation by 2-3psi for a slightly more sporty ride.

As for the rev range, my understanding is that this is important when the engine is being run-in i.e. when new or after a rebuild, not sure it will make any difference to a 'broken-in' engine i.e. with 20k-30k miles or more.

[Tony H]

Whilst on the subject of revs does anyone know at what speed a 2.5 auto in sport mode should change from 3rd to 4th?
The reason I ask is last week I had a run along our local air strip stretching the Meegas legs and noticed it change up into 4th at 120 mph,I didn't look at the rev counter but have the feeling it wasn't at the blood line.
I used to own a Granada that would do its top speed in 3rd as well as 4th :-/

[Kevin Wood]

My 3.2 changes up from 3rd to 4th early if not in sport mode and absolutely floored.

I can't recall what speed. I'm always too busy looking for coppers the braking point for the next corner of my private test track. It wouldn't be much more than 120 and, given that the 2.5 is shorter geared that's probably not far off the red line.

Kevin

[TheBoy]

My earlier software would not change into 4th in sports mode - just carry on down the road track banging off the limiter at 130mph.

Believe it or not, not tried since updating firmware...

[Taxi_Driver]

I have 235/40/17's on the front and 265/40/17's on the rear and I had been running mine at slightly lower pressures since I had new tyres put on as the previous tyres (rears) had shown signs of over inflation by wearing in the middle. Big Rod (the previous owner) said he had normally run them at 30psi all round, so I've been running them at 28psi.
Since then I noticed my mpg reduced to around 22 on average to and from work. I checked my pressures last night and they were slightly down on the original 28psi I put in a few weeks ago, so thought I'd try them back at 30psi as these tyres are a slightly softer compound than the last set. I reset my MID this morning and was amazed that after my 22 mile journey to work my average mpg had gone up to over 25.

It will be interesting to see what average mpg I get going to Newent this weekend. :-?

Dont forget tho Bob......the rears should be 3psi higher than the fronts on estates.....i assume that applies for your 265's as well.

I run my 225's 30 front and 33 back  

Tho my tyres take abuse......coz one min it can be just me in it......10mins later 4 15 stone passengers    

I did once inflate to 33 front 36 back as a comprimise.......but overinflation wear started showing after a time.

[bob.dent]

I have 235/40/17's on the front and 265/40/17's on the rear and I had been running mine at slightly lower pressures since I had new tyres put on as the previous tyres (rears) had shown signs of over inflation by wearing in the middle. Big Rod (the previous owner) said he had normally run them at 30psi all round, so I've been running them at 28psi.
Since then I noticed my mpg reduced to around 22 on average to and from work. I checked my pressures last night and they were slightly down on the original 28psi I put in a few weeks ago, so thought I'd try them back at 30psi as these tyres are a slightly softer compound than the last set. I reset my MID this morning and was amazed that after my 22 mile journey to work my average mpg had gone up to over 25.

It will be interesting to see what average mpg I get going to Newent this weekend. :-?

Dont forget tho Bob......the rears should be 3psi higher than the fronts on estates.....i assume that applies for your 265's as well.

I run my 225's 30 front and 33 back  

Tho my tyres take abuse......coz one min it can be just me in it......10mins later 4 15 stone passengers    

I did once inflate to 33 front 36 back as a comprimise.......but overinflation wear started showing after a time.

With normal wheels and tyres I'd agree Dave, but the tyres that came off the rear were worn in the middle which would indicate over inflation. I'm going to see Tony at WIM tomorrow so I'll see what he recommends.